U. S. NATIONAL MUSEUM 



PROCEEDINGS, VOL. 58 PL. 14 



I. HOLOCHILUS INCARUM. 



2. ORYZOMYS AURILLUS. 



3. HESPEROMYS FRIDA. 



^■Q 



4. Thomasomys NOTATUS. 



5. Thomasomys gracilis. 

 SKULLS OF PERUVIAN MAMMALS. 



For explanation of plate see page 249. 



